DE102016122231A1 - Clip filter for a hydraulic valve and hydraulic valve with such a clip filter - Google Patents

Abstract

The invention relates to a clip filter for a hydraulic valve with filter elements received in a carrier frame, wherein the carrier frame (41) is annular and has a clip filter lock (42), wherein ends (43, 44) of the carrier frame (41) for closing the clip filter (35 ), wherein the first end (43) has a nose-shaped clip element (45) and the second end (44) has a recess (46) complementary to the clip element (45). According to the invention, the clip filter lock is designed to be optimized for opening.

Description

Technical area

The invention relates to a clip filter for a hydraulic valve and a hydraulic valve with such a clip filter.

State of the art

Clip filter for hydraulic valves are for example from the DE 10 2007 050 447 A1 known. The clip filter usually consists of two generally semicircular shells, which are connected at one end to each other and to each other movable and at the other end to bring about a closed ring each have a complementary part of a clip filter lock. To prevent dirt from entering the hydraulic valve, make sure that the clip filter or clip filter lock does not open even at high load peaks.

Also the DE 100 27 080 A1 discloses a clip filter, wherein a first end of the clip filter, a second end of the clip filter is designed only partially receiving, whereby a release of the two ends depending on the load of the clip filter is relatively easily possible.

Disclosure of the invention

The object of the invention is to provide an improved, robust and at the same time cost-effective clip filter for a hydraulic valve. In addition, a hydraulic valve is to be provided with a clip filter, which is reliably protected against dirt entry and thus robust and permanently functional.

The above objects are achieved with the features of the independent claims. Advantageous embodiments with expedient and non-trivial developments of the invention are specified in the respective subclaims.

An inventive clip filter for a hydraulic valve has a support frame with filter elements received in the support frame. The support frame is annular and has a clip filter lock. Ends of the support frame are for engaging the clip filter engageable with each other, wherein the first end of a nose-shaped clip member and the second end have a clip element complementary to the recess. According to the invention, the clip filter lock is designed to be optimized for opening. In other words, high forces must be used to open the clip filter lock, whereas closure of the clip filter lock takes place with much less effort. As a result, a robustness of the clip filter lock during operation is considerably increased compared with the prior art while at the same time being easy to mount. The clip filter remains securely closed during operation, especially at high one-time load peaks.

In particular, the recess is the nose-shaped clip element in the locked state in the circumferential direction completely and in the radial direction at one end completely and the other end is formed predominantly comprehensive. In other words, this means that the recess almost completely encompasses the clip element. The clip element can thus neither move in the radial direction, since it is completely surrounded by the recess in the circumferential direction, nor can it move in the circumferential direction, since it is enveloped at one end completely over its radial extent and at the other end predominantly over its radial extent from the recess ,

In a further embodiment, the nose-shaped clip element is wedge-shaped with an underside and an upper side facing away from the underside formed upper side and the recess is complementary, having complementary surfaces, designed for this purpose. The advantage of the wedge-shaped clip element, which is tapered in particular in the closing direction, can be seen in the fact that a simplified insertion into the recess is made possible.

To further increase the opening forces to be expended, the clip element and the recess each have at least one surface portion formed orthogonally to the opening or closing direction. This means that in order to overcome a wall or surface formed perpendicular to the opening or closing direction, in particular the opening forces are substantially increased in comparison to the prior art.

An additional safeguard against opening is brought about by the formation of a bead, which is formed on a surface of the recess lying opposite a lower side of the clip element, and wherein the underside has a recess which is complementary to the bead.

In a further embodiment, a trained on an outer side of the support frame outer arm for changing position during the closing operation is formed. The recess, which is designed to receive the nose-shaped clip element, divides the support frame in the region of the recess into two outer arms, between which it is formed. To reduce the forces to be applied when closing the clip filter, the one facing away from the underside of the clip element is External arm, thus formed on the outside of the support frame outer arm, designed to be flexible, so that a change in position of the outer arm in the radial direction to the outside is possible.

In a further embodiment, this flexibility is realized by means of a cross-sectional reduction, which has the outer arm in the region of the recess.

The flexibility to change the position is also to be achieved with a fillet, which has the outer arm on its side facing away from the clip element side. This fillet may also be formed in combination with the cross-sectional reduction, resulting in improved flexibility. Furthermore, the rounding can avoid a possible breaking off of the outer arm, if too high closing force is used during assembly.

To provide a cost-effective clip filter, the filter elements are integrally formed as a band plate with filter openings, wherein the band plate is provided injected into the support frame.

The second aspect relates to a hydraulic valve having a valve sleeve and a valve piston axially displaceable in the valve sleeve along a longitudinal axis of the valve sleeve. The hydraulic valve has a supply port for supplying a hydraulic fluid, at least one working port and at least one tank port for discharging the hydraulic fluid. The valve piston is displaceable by means of an electromagnetic actuator of the hydraulic valve, wherein the supply connection and / or the working connection are covered by a clip filter according to one of the preceding claims. The advantage of the invention is the provision of a hydraulic valve, which is designed due to a secured against opening clip filter reliably against possible contamination. This leads to a life extension of the hydraulic valve according to the invention, which can be significantly reduce warranty and goodwill costs. Likewise, the hydraulic valve according to the invention serves a life extension of the unit having it, such as, for example, a mechatronic transmission control or a camshaft adjuster.

Favorable embodiments and advantages of the invention will become apparent from the other claims, the description and the drawings.

Brief description of the drawings

Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown. The drawings, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

They show by way of example:

1 a section through a hydraulic valve according to an embodiment of the invention in a de-energized initial position;

2 an open clip filter according to the prior art and

3 an enlarged section of a closed clip filter according to the invention.

Embodiments of the invention

In the figures, the same or similar components are numbered with the same reference numerals. The figures are merely examples and are not intended to be limiting.

1 shows a longitudinal section through a hydraulic valve 1 according to an embodiment of the invention. The hydraulic valve 1 in the form of a proportional valve serves as an example for use in an automated transmission. An inventive clip filter 35 can in the hydraulic valve described below 1 find exemplary application, but also in other hydraulic valves, such as in a provided as a cartridge valve for adjusting a camshaft adjuster hydraulic valve used.

The hydraulic valve 1 has a valve bush 2 and one in a stepped bore 38 the valve socket 2 along a longitudinal axis 4 the valve socket 2 axially displaceable valve piston 3 on. The valve piston 3 is with the help of an electromagnetic actuator 5 of the hydraulic valve 1 displaceable. The actuator 5 , which is a magnetic part of the hydraulic valve 1 represents, has one with the valve piston 3 operatively connected anchor 7 on, which is coaxial with the valve sleeve 2 is arranged. Next is the anchor 7 with the help of the anchor 7 comprehensive magnetic coil 6 movable in a housing 8th of the actuator 5 taken, the anchor 7 in a pole tube 9 and a pole core 10 slidably arranged.

An energization of the magnetic coil 6 leads to the axial displacement of the valve piston 3 wherein one at one of the actuator 5 opposite end face 11 of the valve piston 3 arranged retaining element 12 a retention force on the valve piston 3 exerts, against which the valve piston 3 to move. The retaining element 12 , in this embodiment in the form of a helical compression spring trained, relies on a lid 13 off, which in the area one from the actuator 5 turned away housing end face 14 with interference fit in the valve sleeve 2 is arranged.

The magnetic coil 6 is radially inward of a bobbin 16 limited in the housing 8th taken, the housing 8th in one piece with the pole core 10 is formed, which the pole tube 9 is arranged opposite. The cylindrical pole core 10 is the valve bush 2 facing and an end portion 15 the valve socket 2 arranged comprehensively. The cylindrical pole tube 9 indicates its from the pole core 10 turned away end of an anchor space 17 bounding wall 18 on.

The non-conductive coil carrier 16 in which a coil winding of the magnetic coil 6 is received, has a U-shaped profile and is on the pole tube 9 as well as on the pole core 10 placed. The pole tube 9 and the polkernel 10 can according to a in 3 embodiment shown in one piece and be provided connected by means of a very thin connecting web, in which case the pole core 10 and the case 8th are formed as separate components.

In operation, the solenoid coil 6 excites and generates a magnetic field, which is the pole core 10 , the anchor 7 , the pole tube 9 and the case 8th magnetized. The pole core 10 included end section 15 is also detected by the magnetic field.

A piston plunger 39 at the end of the valve piston 3 lies with his the anchor 7 facing trained face 19 on a non-stick element 20 on, on one of the end face 19 facing formed first end face 21 of the anchor 7 is arranged. Thus, the valve piston 3 with the anchor 7 operatively connected and an axial movement of the armature 7 is on the valve piston 3 transferable. The non-stick element 20 is disc-shaped and serves to avoid sticking of the anchor 7 at the magnetically conductive valve socket 2 , Furthermore, the non-stick element closes 20 as far as possible a flow-through anchor channel 22 , which is central and along the longitudinal axis 4 in the anchor 7 extending and formed as a bore.

In the illustrated position of the hydraulic valve 1 is between the anchor 7 and the valve sleeve 2 an annular first space 23 educated. The first room 23 is about at least one in the non-stick element 20 introduced and this in the direction of the longitudinal axis 4 completely penetrating opening 58 over the anchor channel 12 22 with an annular second space 24 permeable connected, the second space 24 between one of the first end face 21 turned away second end face 25 of the anchor 7 and the wall 18 of the pole tube 9 is designed. This means that at any time a pressure balance between the rooms 23 . 24 is possible. Thus, the anchor needs 7 only a shift work due to the valve piston 3 with a displacement of the valve piston 3 in the from the actuator 5 exercise the opposite direction and points to the adjustment of the valve piston 3 a fast response time.

The valve bush 2 is by means of sealing elements 26 . 28 sealing, for example, in a transmission component 27 arranged and has a supply port P for supplying the hydraulic fluid, at least one working port A and at least one tank port T for discharging the hydraulic fluid. The supply port P, the working port A and the tank port T are in the valve sleeve 2 a first annular groove 29 , a second annular groove 30 or a third annular groove 31 assigned, each via connection channels 32 . 33 . 34 with the connections of the transmission component 27 are connected. There are another two tank ports T1 and T2 for leakage in the transmission component 27 provided, the tank connections T and T1 in a common connection channel 34 of the transmission component 27 lead.

The supply port P is designed for connection to an oil pump, not shown, so that the hydraulic valve 1 with the hydraulic fluid, which is oil in this embodiment, can be supplied. The first ring groove 29 and the second annular groove 30 each have a clip filter 35 for filtering the hydraulic fluid.

The valve piston 3 has a circumferential annular groove 36 on. Depending on the positioning of the valve piston 3 Either the working connection A is connected to the tank connection T, as shown, or the supply connection P can be flowed through to the working connection A.

A sealing element 37 in the form of a cross-sectionally U-shaped, for example deep-drawn disc serves the spatial separation of magnetic and hydraulic part of the hydraulic valve 1 and becomes in the end section 15 the valve socket 2 arranged. Preferably, the sealing element 37 into the hole 38 pressed.

As can be seen, the piston plunger protrudes 39 an inner thigh 59 of the sealing element 37 contactless, so that one between piston plunger 39 and thighs 59 emerging gap acts as a sealing gap and thus as a gap seal, which can be reduced by the ratio of sealing length to gap height of the sealing gap replacement of the hydraulic fluid to a minimum.

This allows an exchange of dirt particles, which magnetic and / or the affect hydraulic functions, between the magnetic and the hydraulic part of the hydraulic valve 1 be significantly reduced. In particular, a negative influence on the armature run in the pole tube 9 and the resulting magnetic / valve hysteresis can be prevented.

To protect the hydraulic valve 1 and the entire hydraulic part of the mechatronics against contamination, cover the annular clip filter 35 the connections P and A. In the delivery condition are the clip filters 35 open at one point of the circumference to assemble them. 2 shows a known clip filter 40 in an open state. The disadvantage of known clip filters 40 in that these are due, for example, to the high flow forces during the initial filling of the hydraulic valve 1 unintentionally open, leaving the function of the clip filter 40 during operation of the hydraulic valve 1 no longer exists. Even high load peaks can lead to unwanted opening of the known clip filter 40 to lead.

The clip filter according to the invention 35 , which is partially in 3 is shown greatly enlarged, points in a support frame 41 recorded, not shown in detail filter elements, wherein the support frame 41 is annular. A clip filter lock 42 of the clip filter 35 which is used to close the clip filter 35 serves, has mutually engageable ends or end portions 43 . 44 the support frame 41 on. As can be seen, the second end points 44 a nose-shaped clip element 45 on which for closing the support frame 41 in a complementary recess 46 the first end 43 intervenes. To unintentionally open the clip filter 35 to exclude, according to the invention is the clip filter lock 42 designed optimized opening.

Under the opening-optimized clip filter lock 42 is a clip filter lock 42 understand that low assembly and closing forces and yet high opening forces provides. In other words, that the opening forces to open the clip filter lock 42 are much higher than the closing forces required to close the clip filter lock 42 necessary. This means that the clip filter lock 42 on the one hand must have a certain flexibility in the closing process, whereas it is to be designed inhibiting in a possible opening process. This is achieved by means of an optimized longitudinal extension of the clip filter lock 42 reached in the circumferential direction. In other words, that means a male part of the clip filter lock 42 , which in the form of the nose-shaped clip element 45 is executed, and a female part of the clip filter lock 42 , which take the form of the recess 46 is configured, in their extensions in the radial direction and circumferential direction with respect to the possible on the clip filter 35 to be adapted to acting forces.

The nose-shaped clip element 45 is substantially wedge-shaped with a bottom formed substantially parallel to the opening or closing direction 47 and a top 48 formed, wherein the length of the clip element 45 and the recess 46 is formed in the circumferential direction such that the clip filter lock 42 has a certain flexibility. The recess 46 points to the bottom 47 and top 48 complementary surfaces 49 . 50 on.

Next point the clip element 45 as well as the recess 46 each orthogonal to the opening or closing direction, ie formed to the circumferential direction surface portions 51 . 52 on, which bring an opening by circumferentially acting forces against a high resistance. As a result, the expended for opening circumferential forces are substantially increased.

The orthogonal area proportions 51 . 52 close up as if 3 seen on the top 48 or the area 50 at. The top 48 is opposite the bottom 47 formed inclined in the circumferential direction, whereby the clip element 45 having a circumferentially variable cross-section Q extending from an element tip 62 in the direction of the first area fraction 51 increased.

The recess 46 is thus the nose-shaped clip element 45 in the locked state in the circumferential direction completely and in the radial direction at one end, at its element tip 62 , completely and otherwise, at its elemental tip 62 turned away end, mostly carried out comprehensively.

The clip element 45 is by means of a bridge 64 with the end 44 the support frame 41 connected. The jetty 64 has in the illustrated embodiment, a web cross-section S, which minus a rounding 65 on the first area share 51 a half cross section Q of the clip element 45 on the first area share 51 equivalent. The web cross-section S is dependent on the possible, during operation of the hydraulic valve 1 on the clip filter 35 acting forces or on the bridge 64 resulting forces to be interpreted so that circumferential forces are absorbed in particular during the closing and opening operation without failure, ie crack or breakage of the web. The rounding off 65 serves to reduce the closing forces to be applied.

The bottom 47 of the clip element 45 assigned area 49 the recess 46 has a bead 53 on, with the bottom 47 of clip element 45 a complementary recess 54 having. The bead 53 moves the orthogonal area fraction 51 of the clip element 45 at opening acting peripheral forces against the orthogonal surface portion 52 the recess 46 , so that the opening forces increase and opening the clip filter 35 additionally difficult.

The carrier frame 41 points in the circumferential direction in the region of the recess 46 a first outer arm 60 on its outside 55 and this opposite a second outer arm 61 on, between which the recess 46 is formed extending. The clip element 45 is between the first outer arm 60 and the second outer arm 61 in the recess 46 completely recorded.

As can be further seen, the outside faces 55 the support frame 41 in the region of the recess 46 , ie in the area of the top 48 a cross-section reduction 56 on which to the shape of the clip element 45 or the recess 46 is provided adapted. In other words, that means the first outer arm 60 a cross-sectional change of its arm cross-section AQ starting from its element tip 62 facing trained first end of arm 66 up to its one side surface 63 of the end 44 opposite to arrange second arm end 67 has. The Armquerschnitt AQ is in one, the top 48 covering area, predominantly the slope of the top 48 of the clip element 45 adapted, constant in the radial direction.

The cross-section reduction 56 serves to increase the flexibility and allows closing the clip filter 35 an elastic deformation radially outward. Thus, the first outer arm 60 formed to change position during the closing process.

In the area of the bottom 47 is the cross section of the support frame 41 optimized so that this area is provided less flexible in order to minimize the likelihood of a radial impact on the installation space and the associated higher closing forces or stresses. The cross-section reduction 56 goes into a rounding off 57 to achieve an optimal compromise between low stress on closing and flexibility.

The clip filter lock 43 allows easier installation due to lower closing forces, but prevents unwanted opening of the clip filter 35 at high load peaks or at the first filling. This protects the clip filter according to the invention 35 the hydraulic valve 1 reliable against contamination.

The filter elements can, for example, provided in one piece as a band plate with filter openings and in the support frame 41 , which preferably consists of plastic, be provided injected.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102007050447 A1 [0002]
• DE 10027080 A1 [0003]

Claims (12)

Clip filter for a hydraulic valve with filter elements received in a support frame, the support frame ( 41 ) is annular and a clip filter lock ( 42 ), where ends ( 43 . 44 ) of the support frame ( 41 ) for closing the clip filter ( 35 ) are engageable with each other, the first end ( 43 ) a nose-shaped clip element ( 45 ) and the second end ( 44 ) one to the clip element ( 45 ) complementary recess ( 46 ), characterized in that the clip filter lock ( 42 ) designed to be optimized for opening. Clip filter according to claim 1, characterized in that the recess ( 46 ) the nose-shaped clip element ( 45 ) in the locked state in the circumferential direction completely and in the radial direction at one end is completely formed and the other end predominantly comprehensive. Clip filter according to claim 1 or 2, characterized in that the nose-shaped clip element ( 45 ) wedge-shaped with a bottom ( 47 ) and one from the bottom ( 47 ) facing away from the top ( 48 ) is formed and the recess ( 46 ) complementary, having complementary surfaces, is configured. Clip filter according to one of the preceding claims, characterized in that the clip element ( 45 ) as well as the recess ( 46 ) each at least one orthogonal to the opening or closing direction formed surface portion ( 51 . 52 ) exhibit. Clip filter according to one of the preceding claims, characterized in that the recess ( 46 ) one of a bottom ( 47 ) of the clip element ( 45 ) opposite surface ( 49 ), the area ( 49 ) a bead ( 53 ) and the underside ( 47 ) of the clip element ( 45 ) one to the bead ( 53 ) complementary recess ( 54 ) having. Clip filter according to one of the preceding claims, characterized in that a on an outer side ( 55 ) of the support frame ( 41 ) trained external arm ( 60 ) is designed to change position in a closing operation. Clip filter according to claim 6, characterized in that the outer arm ( 60 ) of the support frame ( 41 ) in the region of the recess ( 54 ) a cross-section reduction ( 56 ) having. Clip filter according to claim 7 or 8, characterized in that the outer arm ( 6 ) at its from the clip element ( 45 ) side facing away a rounding ( 57 ) having. Clip filter according to one of the preceding claims, characterized in that the filter elements are integrally formed as a band plate with filter openings, wherein the band plate in the support frame ( 41 ) is injected. Hydraulic valve with a valve bush ( 2 ) and one in the valve socket ( 2 ) along a longitudinal axis ( 4 ) of the valve bush ( 2 ) axially displaceable valve piston ( 3 ), with a supply port (P) for supplying a hydraulic fluid, at least one working port (A) and at least one tank port (T1; T2) for discharging the hydraulic fluid, wherein the valve piston ( 3 ) by means of an electromagnetic actuator ( 5 ) of the hydraulic valve ( 1 ) is displaceable, wherein the supply connection (P) and / or the working connection (A) of a clip filter ( 35 ) are covered according to one of the preceding claims. Hydraulic valve according to claim 10, characterized in that the hydraulic valve ( 1 ) is provided as an electro-hydraulic proportional valve in particular for a mechatronic transmission control. Hydraulic valve according to claim 10, characterized in that the hydraulic valve ( 1 ) is provided as a cartridge valve for adjusting a camshaft adjuster.

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